Electric switch



E. CHAPMAN oct. 25, 1932.`

ELECTRIC SWITCH Filed Nov. 6, 1928 2' @da A TTORNEY r Patened Oct. 25, 1932 fe w reference to si plufelisy of? eeuw mary objecb,

dlisiiogu" coucliiious Vides 'for eration sleiiog' s Uueiaoi., loeceuse c o sliepe of elle i suoli lesion "with moet?, hemel, *wheres-s o single @se when ilelieessiug @the loic o ther increasing the useful 'm or. e i or the type just riescriloed, J iuveutio.- om Vies e colas scheme which e er in associetiou Wirth suitslole iuolicis startil button greatly ireqor'ovesr lie olieu tinguishobility oI the two eelsuelors. suolo, scheme contemplating the use o o for the starting actuator, reel colorz the stopping actuator andi e eompoisively darker and contrasting color, suoli ss Lecka for the top plete which surrouutls emo oosi tions the actuators. Also for' use in c tion with this actuator errengemeus, Ventiou further provides improveoi sl ary suol movable 'Contact mechanism mouniugs which are of such consiruoziou es to not only insure positive suol cerfceiu @pesetion but to also materially reduce elle eosin of manuiecturing'and assembliug eine iuflivicl ual parts.,

To the accomplishment of elle 'foregoing and related ends, said invension, @lieu7 couc sis's of che means hereinafter fully desosilie end particularly poim'gedl out iu alle claims elle euuexecl drow? *c emol the following cle scri-.phon setting Eo v deioil seres-.iu iguie embodying the mveuiou, such disclosed?. meses constituting however, lout one o-E' vos nous mecuauicel wie iu which he le eue iureui J be useel.

oodyiug iliegp "Lilou View o e of ST5; e moer uur@ of s :mol

iuveniou is llore s su ouier casino; l()

lll, opposite ci insures@ loro iles.H

o ille side Wells manner shown on@ o e conduitA l@ sied secured io o ley means of the scie. mounting; 18 Wliiel "die contacts enel l lie manner llereiueier explained.

16 is secured "eo elle lll l sesews l?) end loes ceucreily ilisposecl epee.

QU through which elle Contact oci members 2l ond project. Filis in these conect actuators is here shown es push louiiou which is iixedly mouse-ed upon-r ille upper euri of o slief 23, suoli sliez; Else reciprocebljy mouuecl in e boss amil @eifrig-- img ou its lower @ucl sliglrily loose co i disc 25. Between che lower fece of tlm een snol 'elle upper fece oelle boss laelicel compression spring; 26, sluis spring circling the shaft S23 snol seeing to liolcl suoli button iu ies miseri or iuopereuive posiion an@ ille disc 25 ouv@ of eu ogemeui. Wish the contacts 27 and 28. lie ouer oi elle contact acueu'aors alcove refereed 55o consists of ou emule? sliepe push piece ably coacting with the inner surface32 of the mounting 18. To the top of the shoulder between the enlargement 31 and the surface 30 is secured a contact ring 38, and between the underside of such enlargement and a concave seat 34 which surrounds the boss 24 is a compression spring 35, this spring functioning to hold the push piece 22 in its elevated position and the ring 33 in engagement with the contacts 36 and 37 These contacts, the plate 38, and the plate 39 are firmly held against y the opposite ends of the mounting 18 by means of the tie screws 40. Another plate 41 is held in the position indicated in Fig. 6 by a screw 42, and each of such plates has a wire attaching screw 43 for making the usual connect-ions with the conductors of a motor Vstarting or like circuit, such conductors as above stated passing into the casing 10 through the openin l5.

YIt will be understood that the fixed contacts 36, 37, 27 and 28 are connected in such a manner that the downward movement of the push button 21 will be effective to start the motor in the circuit by electrically connecting the latter two of such contacts, and that the downward movement of the push piece 22 will be effective to stop such motor by electrically disconnecting the former two of such contacts. The inner contact actuator 21 is desirably although not necessarily formed of a green insulating material such as bakelite, and the outer contact actuator 22 may be formed of a similar material colored red. The top plate 16 is also formed of insulating material and if desired it may be colored black cr given some other dark color in order to form a contrasting background for the contact actuators. This color scheme has the effeet of making such actuators clearly visible and easily distinguishable in the light, and their relative arrangement materially contributes to their distinguishability in the dark. Furthermore, it will be noted that the top of the push piece 22 extends above the top of the push button 21 and that the former is disposed in concentric relation to the latter. It is thus apparent that in starting the motor, the operator must deliberately insert his finger into the cup-like surrounding part of the push piece 22 in order to depress the button 21, and that in stopping such motor, any part of the hand can be used for depressing the push piece 22. In other words, the starting of a motor by means of my improved switch requires that the operator give speci fic attention to the starting operation, and this 1n turn has a tendency to induce a mental review of the situation which may lead to the discovery of something which would cause damage in case the motor was started. On

the other hand, the stopping contact actuator is so positioned that such motor may be quickly stopped in the event of an emergency; it only being necessary to depress the annular push piece 22, an operation which can be readily effected because the relatively more accessible position of such push piece as compared with that of the starting button 21.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the structure herein disclosed, provided the means stated by any of the following claims or the equivalent of such stated means be employed.

I therefore particularly point out and distinctly claim as my invention l. In an electric safety switching device having a plurality of movable contacts, the combination of a hollow member for actuating one of such contacts, and means terminating in a relatively inaccessible position within said hollow member for actuating another of said contacts.

2. In an electric safety switching device having a plurality of movable contacts, the combination of a hollow member for actuating one of said contacts, and a push button terminating in a relatively inaccessible position within said hollow member for actuating another of said contacts.

3. In an electric safety switching device having a plurality of movable contacts, the combination of a tubular member for actuating one of said contacts, said member having a cup shaped end, and a push button terminating in a relatively inaccessible position within said cup shaped end for actuating another of said contacts.

4. In an electric safety switching device having a plurality of movable contacts, the combination of a resiliently supported hollow member for actuating one of said contacts2 and a resiliently supported member terminating in a relatively inaccessible position within said hollow member for actuating another of said contacts.

5. In an electric safety switching device, the combination of a plurality of fixed contacts, a plurality of movable contacts for engagement with said fixed contacts, a hollow member normally maintaining one of said movable contacts in en agement with some of said fixed contacts, an means terminating in a relatively inaccessible osition within said hollow member normal y maintaining another'of said movable contacts out of engagement with some of said fixed contacts.

6. In an electric safety switching device,-

the combination of a plurality of fixed contacts, a plurality of movable contacts for engagement with said fixed contacts, a resiliently supported tubular member normally maintaining one of said movable contacts in engagement withsome of said fixed contacts,

and a resiliently supported posh button ter-1 I minating in a relatively inaccessible position within said tubular membenancl normally maintaining one of said movable contacts out of engagement with some of said @Kerl contacts. v

7. In an electric safety switching levioe9 the combination of a movable Contact actaator with its one terminal in the form o' a cup, and a movable contact actuator in the form of a button in a relatively inaccessible position Within such cup.

Signed by me, this 5th day o November9 EVERETT CHAPMAN 

